In a previous post, I provided an account of society S being required to be some way (or do some particular thing) W entirely in terms of more familiar requirements that participants (individuals, but perhaps also collectives that count as agents) do enough or do their part to help S realize W. In the comments, I noted that David Estlund provides something of a different account, in terms of: (a) participants being required to do their part to help S realize W, but only if everyone else does their part and (b) it being the case that S ought to be W (this being the evaluative use of ‘ought’, distinct from S being required to be W). I voiced some general sympathy with the need to include something like [b], while preferring my imperfect but unconditional agential requirements (that might well entail Estlund’s perfect but conditional agential requirements).
Here is a sketch of what I think is a better analysis: for S to be required to be W = (i) S failing to be W being indignation-worthy and because of this (ii) all participants being required to do something (or enough or their part) to help S be W.